STABILITY STUDIES ON DRIED EXTRACTS OF PASSION FLOWER (PASSIFLORA-INCARNATA L)

Long-term stability studies on dried extracts of passion flower were c arried out under isothermal conditions using a high performance liquid chromatographic method. The analysis of the content variation for the single flavonoids isovitexin, isovitexin-2''-glycoside, vitexin and a pigenin-7-glycoside as well as for the total flavonoid content showed the advantageous use of isovitexin-2''-glycoside as a stability indica tor. The intermediate increase in vitexin, isovitexin and apigenin-7-g lycoside can be attributed to the degradation of higher flavonoids. Th e study presented here is helpful in the design and development of pas sion flower preparations.